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Comparative Evaluation of 68Ga-FAPI and 68Ga-DOTATATE PET/CT and PET/MRI in Thyroid Eye Disease

16. září 2026 aktualizováno: Xiao Chen, Daping Hospital and the Research Institute of Surgery of the Third Military Medical University

Thyroid eye disease is an autoimmune disorder that can cause inflammation and fibrosis of the extraocular muscles and orbital tissues. Accurate assessment of disease activity is important for treatment planning, but commonly used clinical scores and conventional imaging each have limitations.

This prospective single-center cohort study will evaluate two molecular imaging approaches, gallium-68-labeled fibroblast activation protein inhibitor (68Ga-FAPI) PET/CT and PET/MR and gallium-68 DOTATATE somatostatin receptor PET/CT and PET/MR, in adults with thyroid eye disease and in a control group without thyroid-related or orbital disease. The study will compare visual and quantitative imaging findings, including maximum standardized uptake value and target-to-background ratio in the extraocular muscles, and examine their associations with clinical activity score and extraocular muscle thickness. The study aims to characterize the ability of these imaging methods, separately and in combination, to assess thyroid eye disease activity.

Přehled studie

Postavení

Nábor

Podmínky

Intervence / Léčba

Detailní popis

This is a prospective, single-center cohort study planned to enroll approximately 50 adults aged 18 to 75 years. The thyroid eye disease cohort will include approximately 30 participants diagnosed according to European Group on Graves' Orbitopathy criteria. The control cohort will include approximately 20 participants without a history of thyroid-related or orbital disease who undergo clinically indicated FAPI or somatostatin receptor PET imaging for another reason; orbital PET/MR acquisition will be added to the existing examination without additional radiation exposure.

Participants in the thyroid eye disease cohort will undergo 68Ga-FAPI and 68Ga-DOTATATE PET/CT and PET/MR imaging within one week. For each tracer, imaging will begin approximately 50 minutes after intravenous administration of 3 to 5 mCi. PET/CT will include a CT acquisition for attenuation correction and anatomic localization followed by three-dimensional PET acquisition of the head for approximately 5 minutes per bed position. PET/MR will include simultaneous PET acquisition and routine MR sequences, including T1-weighted, T2-weighted, and FLAIR imaging. PET images will be reconstructed using an ordered-subset expectation maximization algorithm and fused with CT or MR images.

Nuclear medicine physicians will evaluate images without access to clinical data. Each eye will be visually classified as positive when any extraocular muscle demonstrates uptake greater than background and negative otherwise. For participant-level analysis, a participant will be considered positive when at least one eye is positive. Quantitative analysis will measure maximum standardized uptake value in the superior, medial, lateral, and inferior rectus muscles. A 1-cm region of interest in occipital soft tissue will be used as background. The target-to-background ratio will be calculated as extraocular muscle SUVmax divided by background SUVmax.

Clinical information collected from electronic medical records will include age, sex, disease duration, clinical diagnosis, treatment plan, and Clinical Activity Score. Imaging measures will be compared between groups and modalities and will be examined for associations with Clinical Activity Score and extraocular muscle thickness. Receiver operating characteristic analysis will be used to evaluate diagnostic accuracy.

Typ studie

Pozorovací

Zápis (Odhadovaný)

50

Kontakty a umístění

Tato část poskytuje kontaktní údaje pro ty, kteří studii provádějí, a informace o tom, kde se tato studie provádí.

Studijní kontakt

Studijní místa

  • Čína
    • Chongqing Municipality
      • Chongqing, Chongqing Municipality, Čína, 400010

Kritéria účasti

Výzkumníci hledají lidi, kteří odpovídají určitému popisu, kterému se říká kritéria způsobilosti. Některé příklady těchto kritérií jsou celkový zdravotní stav osoby nebo předchozí léčba.

Kritéria způsobilosti

Věk způsobilý ke studiu

18 let až 75 let (Dospělý, Starší dospělý)

Přijímá zdravé dobrovolníky

Ne

Pohlaví způsobilá ke studiu

Všechno

Metoda odběru vzorků

Vzorek nepravděpodobnosti

Studijní populace

Participants will be selected from adults evaluated in the Department of Nuclear Medicine at the Army Medical Center of PLA between November 2025 and December 2027. The thyroid eye disease cohort will consist of patients meeting European Group on Graves' Orbitopathy diagnostic criteria. The control cohort will consist of patients without thyroid-related or orbital disease who undergo clinically indicated FAPI or somatostatin receptor PET imaging for another reason.

Popis

Inclusion Criteria:

  • For the thyroid eye disease cohort: diagnosis of thyroid eye disease according to European Group on Graves' Orbitopathy criteria.
  • For the thyroid eye disease cohort: scheduled to undergo 68Ga-FAPI PET/CT and PET/MR and 68Ga-DOTATATE PET/CT and PET/MR within one week.
  • For the control cohort: clinically recommended to undergo FAPI or somatostatin receptor PET imaging for another reason, with no history of thyroid-related disease or orbital disease; orbital PET/MR is added to the existing examination without additional radiation exposure.

Exclusion Criteria:

  • Previous bilateral orbital surgery.
  • Treatment with glucocorticoids, monoclonal antibodies, or radiotherapy within the previous month.
  • Inability to remain supine.
  • Contraindication to MRI, including incompatible metallic implants or claustrophobia.
  • Planning pregnancy, currently pregnant, or breastfeeding.

Studijní plán

Tato část poskytuje podrobnosti o studijním plánu, včetně toho, jak je studie navržena a co studie měří.

Jak je studie koncipována?

Detaily designu

  • Observační modely: COHORT
  • Časové perspektivy: PROSPECTIVE

Kohorty a intervence

Skupina / kohorta
Intervence / Léčba
Group 1 Thyroid Eye Disease Cohort

Adults diagnosed with thyroid eye disease according to European Group on Graves' Orbitopathy criteria. Participants undergo 68Ga-FAPI and 68Ga-DOTATATE PET/CT and PET/MR imaging within one week.
Diagnostický test: 68Ga-FAPI PET/CT and PET/MR Imaging

Participants receive 3 to 5 mCi of 68Ga-FAPI intravenously. PET/CT and PET/MR imaging of the head and orbits is performed approximately 50 minutes after injection, with PET acquisition of approximately 5 minutes per bed position. PET/MR includes routine T1-weighted, T2-weighted, and FLAIR sequences. The exact FAPI compound should be added if specified by the radiopharmacy documentation.

Required confirmation: the protocol does not identify the specific FAPI compound, such as FAPI-04.

Diagnostický test: 68Ga-DOTATATE PET/CT and PET/MR Imaging

Participants receive 3 to 5 mCi of 68Ga-DOTATATE intravenously. PET/CT and PET/MR imaging of the head and orbits is performed approximately 50 minutes after injection, with PET acquisition of approximately 5 minutes per bed position. PET/MR includes routine T1-weighted, T2-weighted, and FLAIR sequences.
Group 2 Control Cohort

Adults without a history of thyroid-related or orbital disease who undergo clinically indicated FAPI or somatostatin receptor PET imaging for another reason. Orbital PET/MR acquisition is added to the existing examination without additional radiation exposure.
Diagnostický test: 68Ga-FAPI PET/CT and PET/MR Imaging

Participants receive 3 to 5 mCi of 68Ga-FAPI intravenously. PET/CT and PET/MR imaging of the head and orbits is performed approximately 50 minutes after injection, with PET acquisition of approximately 5 minutes per bed position. PET/MR includes routine T1-weighted, T2-weighted, and FLAIR sequences. The exact FAPI compound should be added if specified by the radiopharmacy documentation.

Required confirmation: the protocol does not identify the specific FAPI compound, such as FAPI-04.

Diagnostický test: 68Ga-DOTATATE PET/CT and PET/MR Imaging

Participants receive 3 to 5 mCi of 68Ga-DOTATATE intravenously. PET/CT and PET/MR imaging of the head and orbits is performed approximately 50 minutes after injection, with PET acquisition of approximately 5 minutes per bed position. PET/MR includes routine T1-weighted, T2-weighted, and FLAIR sequences.

Co je měření studie?

Primární výstupní opatření

Měření výsledku
Popis opatření
Časové okno
Extraocular Muscle SUVmax on 68Ga-FAPI and 68Ga-DOTATATE PET Imaging
Časové okno: At each imaging examination performed within the protocol-defined 1-week imaging period

Maximum standardized uptake value will be measured separately in the superior, medial, lateral, and inferior rectus muscles on PET/CT and PET/MR images for each tracer. Values will be summarized by tracer, imaging platform, eye, and participant group.
At each imaging examination performed within the protocol-defined 1-week imaging period
Extraocular Muscle Target-to-Background Ratio on 68Ga-FAPI and 68Ga-DOTATATE PET Imaging
Časové okno: At each imaging examination performed within the protocol-defined 1-week imaging period

For each extraocular muscle, target-to-background ratio will be calculated as extraocular muscle SUVmax divided by background SUVmax measured using a 1-cm region of interest in occipital soft tissue. Values will be summarized by tracer, imaging platform, eye, and participant group.
At each imaging examination performed within the protocol-defined 1-week imaging period

Sekundární výstupní opatření

Měření výsledku
Popis opatření
Časové okno
Diagnostic Accuracy for Thyroid Eye Disease Activity
Časové okno: At completion of imaging and clinical activity assessment within the protocol-defined 1-week period

Receiver operating characteristic curves will be used to estimate the area under the curve for quantitative 68Ga-FAPI and 68Ga-DOTATATE PET/CT and PET/MR measures in relation to clinically defined thyroid eye disease activity.

Required confirmation: specify the reference standard and exact Clinical Activity Score threshold used to define active disease before submission.
At completion of imaging and clinical activity assessment within the protocol-defined 1-week period
Association Between PET Uptake Measures and Clinical Activity Score
Časové okno: At completion of imaging and Clinical Activity Score assessment within the protocol-defined 1-week period

Pearson correlation coefficients will be used to assess associations of extraocular muscle SUVmax and target-to-background ratio with Clinical Activity Score.
At completion of imaging and Clinical Activity Score assessment within the protocol-defined 1-week period
Association Between PET Uptake Measures and Extraocular Muscle Thickness
Časové okno: At each imaging examination performed within the protocol-defined 1-week imaging period

Pearson correlation coefficients will be used to assess associations of extraocular muscle SUVmax and target-to-background ratio with extraocular muscle thickness measured on anatomic imaging.

Required confirmation: specify the sequence, measurement plane, muscle-specific rule, and unit for extraocular muscle thickness.
At each imaging examination performed within the protocol-defined 1-week imaging period

Další výstupní opatření

Měření výsledku
Popis opatření
Časové okno
Visual Positivity of Extraocular Muscle Uptake
Časové okno: At each imaging examination performed within the protocol-defined 1-week imaging period

Each eye will be classified as positive when any extraocular muscle demonstrates 68Ga-FAPI or 68Ga-DOTATATE uptake greater than background and negative otherwise. At participant level, a participant will be classified as positive when at least one eye is positive. Positivity will be compared between imaging approaches using categorical analyses.
At each imaging examination performed within the protocol-defined 1-week imaging period

Spolupracovníci a vyšetřovatelé

Zde najdete lidi a organizace zapojené do této studie.

Sponzor

Daping Hospital and the Research Institute of Surgery of the Third Military Medical University

Termíny studijních záznamů

Tato data sledují průběh záznamů studie a předkládání souhrnných výsledků na ClinicalTrials.gov. Záznamy ze studií a hlášené výsledky jsou před zveřejněním na veřejné webové stránce přezkoumány Národní lékařskou knihovnou (NLM), aby se ujistily, že splňují specifické standardy kontroly kvality.

Hlavní termíny studia

Začátek studia (Aktuální)

14. listopadu 2025

Primární dokončení (Odhadovaný)

31. prosince 2027

Dokončení studie (Odhadovaný)

31. prosince 2027

Termíny zápisu do studia

První předloženo

16. září 2026

První předloženo, které splnilo kritéria kontroly kvality

16. září 2026

První zveřejněno (Aktuální)

23. září 2026

Aktualizace studijních záznamů

Poslední zveřejněná aktualizace (Aktuální)

23. září 2026

Odeslaná poslední aktualizace, která splnila kritéria kontroly kvality

16. září 2026

Naposledy ověřeno

1. září 2026

Více informací

Termíny související s touto studií

Klíčová slova

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Plánujete sdílet data jednotlivých účastníků (IPD)?

NE

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